Abstract: A plastic fuel tank for motor vehicles, the fuel tank being formed in one piece with a surge tank disposed exteriorly of an interior of the fuel tank. The surge tank is separated from the fuel tank by means of a constriction and is connected with the fuel tank by means of an inlet opening. The surge tank extends out of the fuel tank toward the bottom thereof. In an area of the inlet opening the surge tank is provided with an indentation which forms a connecting passage or duct between the fuel tank and the surge tank. The connecting duct or passage is separate from the inlet opening and a fuel return line is arranged so as to discharge returned fuel into the connecting duct. The fuel return line is provided with a nozzle which, together with the indentation, results in the formation of an injector arrangement for injecting returned fuel and cooler fuel from the interior space of the fuel tank into the surge tank.

Abstract: A subaqueous sequence valve mechanism includes one or more main valves each adapted to be disposed in the water below the surface thereof. A first expansible chamber hydraulic actuator on the main valve operates that valve and also operates a second expansible chamber device against a spring. A hydraulic pressure line or lead from a controlled source above the surface is joined to and controls the submerged actuator. The second expansible chamber is connected in sequence through a throttle valve and a pressure relief valve to one side of a movable barrier in a hydraulic accumulator. On the other side of the movable barrier the accumulator is open to the water. There is also a return, one way flow valve shunting the pressure relief valve. The accumulator is hydraulically protected by a spring loaded check valve discharging into the water.